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Effects of Interconnected Polymer Nanopores Leading to Different Degrees of Confined Polymerization

Wang, Kui; Lei, Jinhua; Nie, Heran; Shen, Lu; Chen, Peng; Zhou, Guangyuan

(Natural) polymersCustomer publicationsPhase analysisPolymer researchSAXS

Effects of Interconnected Polymer Nanopores Leading to Different Degrees of Confined Polymerization

Wang, Kui; Lei, Jinhua; Nie, Heran; Shen, Lu; Chen, Peng; Zhou, Guangyuan

In this study, different degrees of ethylene-confined polymerization (non-confined, slightly confined, and highly confined) are presented in porous polymer microspheres (PPMs) with an interconnected tri-modal pore structure. First, three catalysts, Cp2ZrCl2, Cp2TiCl2, and TiCl4, are attached to the interface of PPMs to form a nano-confined space for ethylene polymerization. Then…
Crystal Structure of a Tetrameric DNA Fold-Back Quadruplex

Chu, Betty; Zhang, Daoning; Hwang, Wonseok; Paukstelis, Paul J.

Customer publications

Crystal Structure of a Tetrameric DNA Fold-Back Quadruplex

Chu, Betty; Zhang, Daoning; Hwang, Wonseok; Paukstelis, Paul J.

DNA can adopt many structures beyond the Watson–Crick duplex. However, the bounds of DNA structural diversity and how these structures might regulate biological processes is only beginning to be understood. Here, we describe the 1.05 Å resolution crystal structure of a DNA oligonucleotide that self-associates to form a non-G-quadruplex fold-back…
Robust poly(aryl piperidinium)/N-spirocyclic poly(2,6-dimethyl-1,4-phenyl) for hydroxide-exchange membranes

Chen, Nanjun; Lu, Chuanrui; Li, Yunxi; Long, Chuan; Zhu, Hong

Customer publications

Robust poly(aryl piperidinium)/N-spirocyclic poly(2,6-dimethyl-1,4-phenyl) for hydroxide-exchange membranes

Chen, Nanjun; Lu, Chuanrui; Li, Yunxi; Long, Chuan; Zhu, Hong

Herein, for realizing the high efficiency and long lifetime of hydroxide exchange membranes (HEMs) for alkaline membrane fuel cell (AMFC) applications, a series of robust poly(biphenyl piperidinium) (PBP)/6-azaspiro undecane (ASU)-functionalized polyphenyl ether (ASU-PPO) membranes were prepared by a crosslinked strategy. Crosslinked PBP-ASU-PPO membrane combines the advantage of PBP and…
Smart release of antimicrobial ZnO nanoplates from a pH-responsive keratin hydrogel

Villanueva, María E.; Cuestas, María L.; Pérez, Claudio J.; Campo Dall′ Orto, Viviana; Copello, Guillermo J.

(Hydro)gelsCharacteristic dimensionCompositesCustomer publicationsNanoparticles & colloidsSAXSShape

Smart release of antimicrobial ZnO nanoplates from a pH-responsive keratin hydrogel

Villanueva, María E.; Cuestas, María L.; Pérez, Claudio J.; Campo Dall′ Orto, Viviana; Copello, Guillermo J.

A smart antibacterial biomaterial based on a keratin hydrogel with pH-dependent behavior and Zinc Oxide nanoplates as biocide agent has been developed. The pH of a chronic wound is basic due to bacterial metabolism. Originally shrank at acid pH, keratin hydrogels swell upon contact with a bacterial contaminated media leading…
Critical Dependence of Molecular Weight on Thermoresponsive Behavior of Diblock Copolymer Worm Gels in Aqueous Solution

Warren, Nicholas J.; Derry, Matthew J.; Mykhaylyk, Oleksandr O.; Lovett, Joseph R.; Ratcliffe, Liam P. D.; Ladmiral, Vincent; Blanazs, Adam; Fielding, Lee A.; Armes, Steven P.

Customer publications

Critical Dependence of Molecular Weight on Thermoresponsive Behavior of Diblock Copolymer Worm Gels in Aqueous Solution

Warren, Nicholas J.; Derry, Matthew J.; Mykhaylyk, Oleksandr O.; Lovett, Joseph R.; Ratcliffe, Liam P. D.; Ladmiral, Vincent; Blanazs, Adam; Fielding, Lee A.; Armes, Steven P.

Reversible addition–fragmentation chain transfer (RAFT) aqueous dispersion polymerization of 2-hydroxypropyl methacrylate was used to prepare three poly(glycerol monomethacrylate)x–poly(2-hydroxypropyl methacrylate)y (denoted Gx-Hy or PGMA-PHPMA) diblock copolymers, namely G37-H80, G54-H140, and G71-H200. A master phase diagram was used to select each copolymer composition to ensure that a pure…
Synthesis and characterization of nanoparticulate silica with organized multimodal porous structure impregnated with 12-phosphotungstic acid for its use in heterogeneous catalysis

Morales, Dolores M.; Frenzel, Romina A.; Romanelli, Gustavo P.; Pizzio, Luis R.

Customer publications

Synthesis and characterization of nanoparticulate silica with organized multimodal porous structure impregnated with 12-phosphotungstic acid for its use in heterogeneous catalysis

Morales, Dolores M.; Frenzel, Romina A.; Romanelli, Gustavo P.; Pizzio, Luis R.

Mesoporous silica (MESSI) nanoparticles with ordered mesoporous frameworks were successfully obtained using the triblock copolymer P123 as the mesoporous template and agar as micropore former. The agar/TEOS ratio influences the specific surface area (SBET) and the micropore area (SMIC). The SBET values increase with the increment of the agar/TEOS ratio…